Nut-lock.



W. E. SHARP.

NUT LOCK.

APPLICATION FILED AUG.22, 19M.

LQQB, 704: Patented June 5, 1917.

WILLIAM E. SHARP, OF CHICAGO, ILLINOIS, ASSIGNOR TO GRIP NUT COMPANY, OFCHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

N UT-LOCK.

Specification of Letters Patent.

Patented June 5, 1917.

Application filed. August 22, 1914. Serial No. 858,030.

To all to 700m) it may concern:

Be it known that I, \VILLIAM E. SHARP,

a citizen of the United States of America,

My invention belongs to that general class of devices designed to beused in cooperation with the ordinary holding bolt nut to preyent thenut from becoming accidentally disengaged from the bolt by reason of jaror vibration, or from any other cause. To this end it consists in thenovel construction, arrangement and combination of parts herein shownand described, and more particularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like orcorrespondingparts,

Figure 1 is a plan View of my improved nut lock;

Fig. 2 is a section substantially on line 2, 2 of Fig. 1;

Fig. 3 shows a bolt with my improved nut lock mounted thereon, andshownin section to illustrate the operation of the lock, and

Fig. .L is a slight modification of the form shown in Fig. 1.

My improved nut lock is designed to be stamped out of a single plate ofmetal of any suitable outline for the ready engagement of the Wrench. 1illustrates the plate, in which is formed a bolt hole 2. In stamping outthe plate or look, a part of the wall is upset, driving the materialback into the plate, thus forming a V-shaped thread or part as shown at3, of suitable form to adapt it to engage with the thread of the bolt towhich it is applied. As shown, this thread does not extend the entirecircumference of the wall of the bolt hole, but leaves a section as at 4without any thread, the wall at that point being substantially at aright angle to the face of the plate.

To secure the most satisfactory results, the bolt hole, if round, shouldbe relatively of such size as compared with the bolt upon which the lockis to be used, as to constitute what may be termed a tight or snug fit,in fact slightly smaller than the bolt, permitting the lock to bepartially threaded on the bolt by the fingers, to a point where a wrenchmay be employed, thereafter requiring the force of the wrench to seatthelock.

The thread engagement locks the nut look upon the bolt in such a manneras to prevent longitudinal movement, and in turning the lock leads itlongitudinally on the bolt, and the vertical wall 4 by reason of thetight fit aforesaid, impinges upon the apexes of the bolt thread, andforcibly draws the V-shaped part into the thread recess of the bolt.This impinging and forcibly drawing action causes a double effect. Itcauses the apex of the bolt thread to tend to cut into the verticalwall, and at the same time to blunt or otherwise mutilate the sharp apexof the thread, as the lock is forced to its seat, and at the same timeit forcibly draws the V-shaped part of the look into effectivefrictional contact with the walls of the bolt thread. This actioncontinues to the point where the lock ceases in its rotation upon thebolt. The snug or tight fit of the lock upon the bolt, the pressing ofthe edge of the lock thread into the root of the bolt thread, alsobringing the sides of the thread on nut lock and bolt in strongfrictional engagement, the slight mutilation of the apex of the boltthread, the friction of the blunted apex upon the scarified or cut faceof the vertical wall of the lock, and the impinging action of thepreferably sharp corner 5 of the lock thread upon the root of thread ofthe bolt, all cooperate to secure a firm lock of the nut look upon thebolt, effectively preventing any accidental loosening by jar, vibration,or otherwise, thus firmly retaining the holding nut in its seatedposition upon the bolt. The holding nut 7 is shown in dotted lines inFig. 3.

Fig. 1 shows a similar lock with the exception that the threaded part 3extends substantially only one-half about the bolt hole 2 in the locknut, while in the preferred form shown in Fig. 1, it is substantiallytwothirds or more of the circumference of the bolt hole.

In actual practice and under trying conditions, I have secured verysatisfactory results with the form shown in Fig. 4, although thepreferred construction is substantially as shown in Fig. 1, as stated.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A look nut, comprising a metal plate ofsuitable size and form, and having a bolt hole formed therein, with asingle section of the wall of the hole less than the entirecircumference thereof, V-shaped to engage a bolt thread and theremaining part of the wall substantially at right angles to the surfaceof the plate, and adapted to impinge upon the apeXes of the thread of abolt upon which the lock is mounted,

2. A look nut, comprising a metal plate of suitable size and form, andhaving a bolt hole formed therein, with a single section of the wall ofthe hole less than the entire circumference thereof and V-shaped toengage a bolt thread, and the remaining part of the wall substantiallyat right angles to the surface of the plate, and adapted to impinge uponthe apexes of the thread of a bolt upon which the lock is mounted, theadvancing end of the, nut thread in the. direction in which the nutwould be rotatedcwhen backed off a bolt, being formed with an impingingpoint adapted to impinge upon the proximate part of a bolt.

3. A threaded bolt in combination with a lock nut, comprising a metalplate of suitable size and form, and having a bolt hole formed thereinof a size adapting it to tightly fit upon the said bolt, a single.section of the wall of the bolt hole less than the circumference thereofV-shaped to engage the bolt thread, and the remaining part of the wallsubstantially at right angles to the surface of the plate and adapted toimpinge upon the apeXes of the bolt thread, substantially as described.

4. A threaded bolt in combination with a lock nut,comprising a metalplate of suitable size and form, and having a bolt hole formed thereinof a size adapting it to form a binding fit upon the bolt, with a singlepart of the wall of the bolt hole less than the entire circumferencethereof shaped to engage the bolt thread, and, the remaining part of thewall adapted to impinge upon the apexes of the bolt thread, theadvancing end of the nut thread, as the plate is backed off the bolt,being'formed withan impinging point adapted to impinge upon theproximate part of the bolt.

In testimony where0f,.I have hereunto signed my name in the presence oftwo subscribing witnesses.

WILLIAM E. SHARP.

Witnesses:

H. F. ALLEN, A. J. CLARK.

V Copies of this patent may boaobtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. G.

